No idea what I've done, I have not upgraded anything or installed new gems but if I issue a command such as gem list, rake features, rake routes or try and create a new rails project, I get the error messages:
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/ 1.8/rubygems/custom_require.rb:27:in `gem_original_require': no such file to load -- fileutils (LoadError) from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/1.8/rubygems/custom_require.rb:27:in `require' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/1.8/rubygems.rb:175:in `ensure_gem_subdirectories' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/1.8/rubygems.rb:487:in `set_home' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/1.8/rubygems.rb:213:in `dir' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/1.8/rubygems.rb:494:in `set_paths' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/1.8/rubygems.rb:239:in `path' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/1.8/rubygems/source_index.rb:60:in `installed_spec_directories' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/1.8/rubygems/source_index.rb:47:in `from_installed_gems' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/1.8/rubygems.rb:141:in `source_index' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/1.8/rubygems.rb:310:in `activate' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/1.8/rubygems.rb:65:in `active_gem_with_options' from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/1.8/rubygems.rb:50:in `gem' from /usr/bin/rake:18
Using OSX.
Any thoughts? Many thanks,
Mike